Aircraft



FIG. 1 is a front view of an aircraft showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view therefor;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a side view thereof.

The broken lines in the drawings represent unclaimed environmental subject matter and form no part of the claim. 

CLAIM The ornamental design for an aircraft, as shown and described. 